Fix `importlib` deprecation

[codecov[bot]]

Codecov Report

Base: 52.98% // Head: 53.09% // Increases project coverage by +0.10% :tada:

Coverage data is based on head (ebf4d7d) compared to base (30a305c). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #45 +/- ## ========================================== + Coverage 52.98% 53.09% +0.10% ========================================== Files 21 21 Lines 855 857 +2 Branches 186 188 +2 ========================================== + Hits 453 455 +2 Misses 396 396 Partials 6 6 ``` | Flag | Coverage Δ | | |---|---|---| | integration_tests | `18.20% <66.66%> (+0.07%)` | :arrow_up: | | total | `52.50% <66.66%> (-0.01%)` | :arrow_down: | | unit_tests | `50.87% <66.66%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/radeklat/delfino/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t) | Coverage Δ | | |---|---|---| | [src/delfino/click\_utils/command.py](https://codecov.io/gh/radeklat/delfino/pull/45/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t#diff-c3JjL2RlbGZpbm8vY2xpY2tfdXRpbHMvY29tbWFuZC5weQ==) | `89.47% <100.00%> (+0.18%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Radek+L%C3%A1t)

:umbrella: View full report at Codecov.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.